/**
 * Created by Administrator on 2019/5/17 0017.
 */
 var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

 var base64DecodeChars = new Array(
     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
     52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
     -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
     15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
     -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
     41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
 
 var _utf8_encode = function (_string) {
     _string = _string.replace(/\r\n/g, "\n");
     var utftext = "";
     for (var n = 0; n < _string.length; n++) {
         var c = _string.charCodeAt(n);
         if (c < 128) {
             utftext += String.fromCharCode(c);
         } else if ((c > 127) && (c < 2048)) {
             utftext += String.fromCharCode((c >> 6) | 192);
             utftext += String.fromCharCode((c & 63) | 128);
         } else {
             utftext += String.fromCharCode((c >> 12) | 224);
             utftext += String.fromCharCode(((c >> 6) & 63) | 128);
             utftext += String.fromCharCode((c & 63) | 128);
         }
 
     }
     return utftext;
 };
 
 var base64decode = function (str) {
     var c1, c2, c3, c4;
     var i, len, out;
 
     len = str.length;
     i = 0;
     out = "";
     while (i < len) {
         /* c1 */
         do {
             c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
         } while (i < len && c1 == -1);
         if (c1 == -1)
             break;
 
         /* c2 */
         do {
             c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
         } while (i < len && c2 == -1);
         if (c2 == -1)
             break;
 
         out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
 
         /* c3 */
         do {
             c3 = str.charCodeAt(i++) & 0xff;
             if (c3 == 61)
                 return out;
             c3 = base64DecodeChars[c3];
         } while (i < len && c3 == -1);
         if (c3 == -1)
             break;
 
         out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
 
         /* c4 */
         do {
             c4 = str.charCodeAt(i++) & 0xff;
             if (c4 == 61)
                 return out;
             c4 = base64DecodeChars[c4];
         } while (i < len && c4 == -1);
         if (c4 == -1)
             break;
         out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
     }
     return out;
 };
 
 var base64 = {
     encode: function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
        input = _utf8_encode(input);
        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
            output = output +
                _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
                _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
        }
        output = encodeURI(output);
        return output;
     },
     Base64CharToHex: function (str) {
         str = base64decode(str);
         var out, i, h;
         out = "";
         i = 0;
         while (i < str.length) {
             h = str.charCodeAt(i++).toString(16);
             h = h.length < 2 ? '0' + h : h;
             out += h;
             //out +=(i > 0 && i % 8 == 0)?"\r\n":", ";
         }
         return out;
     }
 }

export function encode(input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;
    input = _utf8_encode(input);
    while (i < input.length) {
        chr1 = input.charCodeAt(i++);
        chr2 = input.charCodeAt(i++);
        chr3 = input.charCodeAt(i++);
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;
        if (isNaN(chr2)) {
            enc3 = enc4 = 64;
        } else if (isNaN(chr3)) {
            enc4 = 64;
        }
        output = output +
            _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
            _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
    }
    output = encodeURI(output);
    return output;
}